/Engine/Plugins/Enterprise/DataprepEditor/Source/DataprepCore/Public/DataprepAsset.h
Creates an action from the array of action steps or one action per action steps then insert the action(s) to the Dataprep asset at the requested index
True if the insertion is successful, false if the action steps or the index are invalid
bool InsertAction ( const [TArray](API\Runtime\Core\Containers\TArray)< const [UDataprepActionStep](API\Plugins\DataprepCore\UDataprepActionStep) * > & InActionSteps, int32 Index )